The most aim of the ebook is to provide a imaginative and prescient of the dynamics of the most failures in South the US, describing their mechanisms and effects on South American societies. The chapters are written via chosen experts of every state. Human-induced failures also are integrated, comparable to desertification in Patagonia and soil erosion in Brazil.

Biologists had long believed that this talent for neurogenesis was reserved for young, developing minds and was lost with age. But in the early part of the decade Elizabeth Gould, then at the Rockefeller University, demonstrated that new cells arise in the adult brain —particularly in a region called the hippocampus, which is involved in learning and memory. S. and Sweden had shown that neurogenesis also occurs in humans [see “New Nerve Cells for the Adult Brain,” by Gerd Kempermann and Fred H.